Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99c01a968ee40cb…

MALICIOUS

PDF

40.3 KB Created: 2021-04-27 06:25:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e88440fd722d014e12783d79b2d9d661 SHA-1: b40d741bc735f9cf702d3dcfeba9a4ed9f4bad37 SHA-256: d99c01a968ee40cb82f41b5dc3282f14b32b82da86b99b9c77efbc27c4aa27d8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/youtube-roblox-robux-hack-2021-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/free-robux-br-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-stage-samim-sinim-youtube-aid.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-stuf-roblox-store.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hoodie-t-shirt-roblox-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/download-roblox-hack-pc-vehicle-simulator.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-accounts-with-builders-club-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/surprise-texting-hacked-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/red-boy-robux-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/freerobuxvbucksexe.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-cheat-in-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000413b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x413B 24752 bytes
SHA-256: 005e6da8c95e9d3f6c0f9e865401dc1850cf110a7c10d58d6ff15c63a7cbc884
font_01_sfnt_off0000797f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 18992 bytes
SHA-256: a78cb808cf9934314cb802af514755dbc55dbf0b0e65418fb10c5e5afeb867ee

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